Crossflow transition control by upstream flow deformation using plasma actuators

Control of laminar-turbulent transition in a swept-wing-type boundary-layer flow, subject to primary crossflow instability, is investigated using direct numerical simulations. In our previous works, we explored a direct base-flow stabilization aimed at a spanwise homogenous flow manipulation or a di...

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Veröffentlicht in:Journal of applied physics 2017-02, Vol.121 (6)
Hauptverfasser: Dörr, Philipp C., Kloker, Markus J.
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description Control of laminar-turbulent transition in a swept-wing-type boundary-layer flow, subject to primary crossflow instability, is investigated using direct numerical simulations. In our previous works, we explored a direct base-flow stabilization aimed at a spanwise homogenous flow manipulation or a direct crossflow-vortex manipulation by plasma actuators. In this paper, the technique of upstream flow deformation (UFD) is applied, needing by far the least energy input. The actuators, modeled by local volume forcing, are set to excite amplified steady crossflow vortex (CFV) control modes with a higher spanwise wavenumber than the most amplified modes. The resulting nonlinear control CFVs are spaced narrower than the naturally occurring vortices and are less unstable with respect to secondary instability. They generate a beneficial mean-flow distortion attenuating the primary crossflow instability, and thus a delay of the transition to turbulence. Unlike roughness elements for UFD, the employed dielectric barrier discharge plasma actuators allow to set the force direction: Forcing against the crossflow has a direct, fundamental stabilizing effect due to a reduction of the mean crossflow, whereas forcing in the crossflow direction locally invokes the opposite due to a local increase of the mean crossflow. The differences between these settings, also with respect to forcing in streamwise direction, are discussed in detail, and it is shown that a significant transition delay can be achieved indeed with both, however with a differing efficiency and robustness. Additionally, a comparison to a set-up with an excitation of the control modes by synthetic blowing and suction is performed to clarify the role of the direct effect on the base flow.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Amplification
Applied physics
Base flow
Boundary layer transition
Computational fluid dynamics
Computer simulation
Cross flow
Deformation
Delay
Dielectric barrier discharge
Flow distortion
Flow stability
Fluid flow
Mathematical models
Noise control
Nonlinear control
Plasma actuators
Robustness (mathematics)
Suction
Swept wings
Turbulence
Upstream
Wavelengths
title Crossflow transition control by upstream flow deformation using plasma actuators
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